With Fiat currencies we're not questioning the costs of global payment networks, data centres for payment services providers and banks, their office buildings, computers, printing/minting/transportation of notes/coins and so on. It's taken for granted.

The latter, where unused energy of wind/solar that exceeds battery storage capacity can produce #Bitcoin, thus shortening the return on investment of renewable energy. This return can then be used to reinvest in real energy storage capacity.